PS4 suddenly wants to connect to monitor no longer?

Me
- in PlayStation
5

Since yesterday, my monitor shows no signal when I start the PS4 and yes my monitor has an HDMI connection which the last few years has shown no problem and since yesterday suddenly it is no longer.

Following notes:

- HDMI cable checked, worked fine on the TV so I could play on the TV with the PS4

- Monitor has always worked only since yesterday suddenly stopped

- Have a short time power cord in and out of the monitor but only briefly

- I have not changed anything on the screen settings

Fr

Change the input source on the monitor or press and hold the PS4 power button for 5 seconds while switched off.

Me

Did not help

Fr

Does it still work on the TV?

Me

Yes, it does.

Fr

Does the monitor have multiple ports? All tried? Another device connected to the monitor?